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<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>4转义字符</title>
  </head>
  <body>
    <p>
      <!-- &gt;==>,&lt;==< ,&amp;==&,&nbsp;&emsp;==英文，中文空格-->
      &gt;aaa&lt;&nbsp;&emsp;&amp;
    </p>
  </body>
</html>
